Piston-ring.



N. H. HEBERT.

PISTON RING.

APPLICATION FILED 0on9. 1914.

1,1%%,%7@ Patentmi June 29, 1915.

WITNESSES: INVENTEJFI %M- WLM V by SW} New Hampshire,

HAPOLEAN H. HEEEBT, 0F FRANKLIN, NEWH AMPSHIIB/E.

YLST ON -BING.

Specifiedtien of Letters Patent.

Patented. =17 nine 29, M915.

Application filed October 9, me. serial no. reacts.

To all whom it may concern Be it known that I, NAPOLEAN H. HEBE'R'I', a citizen of the United States, residing at Franklin, county of Merrimack, State of have invented a certain new and useful Imp ovement in Piston- Ringe, f which the allowing is a s ecificaticn, reference being had therein to the acccnipanying drawings.

y invention relates to piston rings of th type employed particularly in connection with internal combustion motors and the like and has for its object th production .of a leak-proof ring of im roved cm and constru tion. v f Heretofore so far as known to the serious dificult'y has been experienced by manufacturers in preducingpisten rings which are possessed of the roper amount of tension so that they fit closely against the cyl nder walls and prevent leakage past the iston without scoring or otherwise unduly 1n3uring the cylinder. I have found that rings which are cut from a cast iron pot which is one common method of making them are suificiently soft 'sotllat they do not score or otherwise injure'th cylinders, but are not possessed of the necessary tension or spr ng to prevent leakage. On the other hand, I T

have found that individually cast rings which are well known to'have a greater spring of tension than the other type of ring and thus prevent leakage are too hard and not uniform but are apt to have hardened areas which do not wear equally w1th the softer portions of the ring and, therefore, in a short time wear and score the cylinders. One object of my invention, therefore, s to produce a ring which combines the quahties obtained by using the indlvidually cast ring with those obtained by using theother or pot cast type of ring.

Another object of my invention is to so construct the :ring that it is leak-proof, an

individually cast ring being employed to support a plurality of soft rings which break "joints with each other, and are so constructed that they automatically wedge themselves together in the position given so that no leakage may occur between them.

Another feature 'of the ring embodying my invention is that when the parts are assembled they form a single ring, and no screws, or the like are required to hold. the parts in their proper relation to each other.

My invention will be fully understood from the following description when taken n connection with the accompanying drawmgs and the novel features thereof will be clearly defined and pointed out in the claims at the close of the specification.

In the-drawings Figure 1 is a plan view cf a ring embodyingmy invention. Fig. 2 1s a view in perspective of the same. Fig. 8 is a section on line a-a of Fig. 2. Figs. 4 5 and 6 are sectional details of the parts shown in Fig. hbefore being assembled. Havi g reference to the drawings; Figs. 1 and 2 show a leakpro'of rin it ich consists of a supporting rin 11 and apair of outer rings 12 and 18. T e su orting ring 11 is made of spring metal w ith has the prpper amount of tension or spring reguired to press outwardly against the cyliner walls and prevent the gas from leaking past the piston. This ring is preferably east individually for I have found that rings of this type have the necessary tension, but it may be produced in any other well lmow'n manner for it does not come in contact with the c linder walls and acts merely as a sup orting member for the other rings as will be hereinafter described. he rings 12 and 13, consist of relatively soft metal being preferably pot cast so that they do not score or otherwise injure the cylinder walls.

The supporting ring 11 is of annular shape and provided with the usual opening or cut as shown at 14. In the annular outer surface of the ring 11 is a groove 15.

' The sides'of the groove are beveled as shown at 16 so that they conver e inwardly to form flanges or projections 1 each having a vertical outer surface and a beveled inner surface 16 as best shown in Fig. 6.

The supporting ring 11 hereinabove described carries a pair of outer rings 12 and 13 which are provided with the usual openings 18 and 19. The rings 12 and 13 are of the same size having vertical edges 29 which are adapted to contact so that when placed together the rings form in effect a single outer ring. The opposite sides of each of the rings are beveled as shown at 20 to the same angle asthe bevel of the flanges 17 of the supporting ring 11, the rings together being of such size and shape that they fit within the groove 15 of the supporting ring 11 with the beveled edges 20 restin a ainst the beveled surfaces or walls 16 of the anges 17 When the outer rings 12 and 13 are in position on the supporting ring, their combined width is such that when pressed tightly together as when in the cylinder, there is a space 21 between the bottom of the groove 15 in the supporting ring 11 and the inner periphery of the rings 12 and 13. The outward pressure of the supporting ring 11 causes the flanges 17 to clamp the outer rings tightly together by means of the said beveled portions so that there can be no possible leakage between them." I regard this feature of my invention as an important one for I have found that in leak-proof rings as heretofore constructed although a plurality of outer rings have been employed and their openings arranged in staggered relation a leakage has occurred by reason of the fact that for all practical purposes it is imposs1- ble to commercially manufacture the ring parts so that when assembled they fit with such nicety that no leakage occurs between them. By my construction, however, the parts ad ust themselves so that when under tension they are clamped tightly together.

From the above description it will noted that the supporting ring does not come in contact-with the cylmder walls at any point. This is very important for it enables the use of a split or open spring metal supporting ring ada ted to hold the outer rings 1n place with s cient pressure.

What I claim is:

1. A piston ring consisting of. an inner split or open ring of relatively hard spring .metal, said ring having peripheral flanges rings together,

will tend to press said rings together, thus preventing leakage between them.

2. A piston ring consisting of an inner split or. open ring of relatively hard spring metal, said ring having peripheral flanges forming an outer annular groove, said flanges having beveled inner walls, and two contiguously-placed outer split or open rings of relatively soft metal fitting in said groove between said flanges and pro ecting outward beyond the periphery of the latter, said outer rings each having a beveled face to fit against the beveled walls of said flanges, so that the outward pressure of the inner spring metal ring will tend to press said thus preventing leakage between them, said outer s lit or open rings being so arranged :as to reak joints with each other and also with said inner split or open ring. A

In testlmony whereof I afiix my slgnature, in presence of two witnesses.

Gnoucn P. Dmn, Amen H. Momuson. 

